Yes, and I've encountered people who didn't know a quart is 25% of a gallon. As well as people who knew that a quarter is 1/4 of a dollar, but had never noticed the similarity between the words quart and quarter.

"I saw to what extent the people among whom I lived could be trusted as good neighbors and friends; that their friendship was for summer weather only; that they did not greatly propose to do right; that they were a distinct race from me by their prejudices and superstitions."